Basic facts and the observational situation
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Before presenting a detailed, critical derivation and investigation of GL theory, we offer an overview of the subject, using simple arguments and equations. This chapter is intended mainly for readers who prefer a quick look at the basic relations, e.g., between lens mass and angular separation between images, and who are not interested in the more detailed aspects of gravitational lens theory discussed in later chapters. In particular, a “guide for observers” is presented, concerning the search for, and the detection and verification of GL events. An overview of observed GL candidates is presented in Sect. 2.5.
KeywordsDark Matter Radio Source Very Long Baseline Interferometry Spiral Galaxy Flux Ratio
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